Figure 2.
Cumulative incidence rates of (part A) major cardiovascular events, (part B) total myocardial infarction, and (part C) total stroke by randomized multivitamin assignment in the Physicians' Health Study II.
* The reduction in the number at risk from 10 to 11 years reflects the two phases of PHS II recruitment; PHS I physicians initially enrolled in Phase 1 starting in 1997 were followed longer on average (mean of 13 years) than new physicians recruited in Phase 2 starting in 1999 (mean of 10 years). Crude log-rank P=0.69 for major cardiovascular events, P=0.44 for total myocardial infarction, and P=0.44 for total stroke.